63681604237 has 2 divisors, whose sum is σ = 63681604238. Its totient is φ = 63681604236.

The previous prime is 63681604117. The next prime is 63681604271. The reversal of 63681604237 is 73240618636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62533004356 + 1148599881 = 250066^2 + 33891^2 .

It is a cyclic number.

It is not a de Polignac number, because 63681604237 - 2¹⁵ = 63681571469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63681604037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31840802118 + 31840802119.

It is an arithmetic number, because the mean of its divisors is an integer number (31840802119).

Almost surely, 2^63681604237 is an apocalyptic number.

It is an amenable number.

63681604237 is a deficient number, since it is larger than the sum of its proper divisors (1).

63681604237 is an equidigital number, since it uses as much as digits as its factorization.

63681604237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 870912, while the sum is 46.

The spelling of 63681604237 in words is "sixty-three billion, six hundred eighty-one million, six hundred four thousand, two hundred thirty-seven".